Power Cost Only Rate Case (Details) - Subsidiaries [Member] - Electricity, US Regulated [Member] - USD ($) $ in Thousands	Jul. 01, 2021	Mar. 02, 2021	Feb. 02, 2021	Dec. 09, 2020
PCORC [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 88,000	$ 78,500
Public Utilities, Requested Rate Increase (Decrease), Percentage			4.10%	3.70%
Power Cost Only Rate Case
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 65,300
Public Utilities, Requested Rate Increase (Decrease), Percentage		3.10%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 70,900
Public Utilities, Approved Rate Increase (Decrease), Percentage	3.30%